Help Using uBlock to Change CSS in Chat?

[diyCTB]

Hello,

I am trying to permanently change background color of message in chat when pinged because in dark mode it's a strain on the eyes.
I read that uBlock can do that with Element Picker and then it adds element to My Filters list where you can modify it but I don't know how.

Here is CSS code that is responsible for text background color:

.siropuChatMention {
background: #ffe4b5;
border-radius: 5px;
padding: 5px;
}

And this is element that is added to My Filters:

sanctioned-suicide.net##.js-lbContainer.siropuChatMention.siropuChatMessageRow

Anyone knows how to connect these things together and create a code that modifies background color?

Thanks

 

[Versailles]

It's just changing the color palette, you don't need to modify the CSS directly

 

[diyCTB]

It's just changing the color palette, you don't need to modify the CSS directly

Yes, only this: background: #ffe4b5; but I don't know how to accomplish this in uBlock.

 

[diyCTB]

Change the default yellow background in dark theme to something dark that would contrast between white text and dark silver background. Black background would work. I can't read messages that are pinged at me on PC and smartphone: